#include "dbcfile.h"
#include "mpq.h"

DBCFile::DBCFile(const std::string &filename): filename(filename)
{
    data = NULL;
}

//-------------------------------------------------------------------------

bool DBCFile::open()
{
    MPQFile f(filename.c_str() );

    // Need some error checking, otherwise an unhandled exception error occurs
    // if people screw with the data path.
    if(f.isEof() == true)
    {
        return false;
    }

    unsigned char header[4];
    unsigned int na, nb, es, ss;

    f.read(header, 4); // File Header

    if(header[0] != 'W' || header[1] != 'D' || header[2] != 'B' || header[3] !=
        'C')
    {

        f.close();
        data = NULL;
        wxLogMessage(_T(
            "Critical Error: An error occured while trying to read the DBCFile %s."), filename.c_str() );
        return false;
    }

    //assert(header[0]=='W' && header[1]=='D' && header[2]=='B' && header[3] == 'C');

    f.read(&na, 4); // Number of records
    f.read(&nb, 4); // Number of fields
    f.read(&es, 4); // Size of a record
    f.read(&ss, 4); // String size

    recordSize = es;
    recordCount = na;
    fieldCount = nb;
    stringSize = ss;
    //assert(fieldCount*4 == recordSize);
    assert(fieldCount *4 >= recordSize);

    data = new unsigned char[recordSize *recordCount + stringSize];
    stringTable = data + recordSize * recordCount;
    f.read(data, recordSize *recordCount + stringSize);
    f.close();
    return true;
}

//-------------------------------------------------------------------------

DBCFile::~DBCFile()
{
    delete [] data;
}

//-------------------------------------------------------------------------

DBCFile::Record DBCFile::getRecord(size_t id)
{
    assert(data);
    return Record(*this, data + id * recordSize);
}

//-------------------------------------------------------------------------

DBCFile::Iterator DBCFile::begin()
{
    assert(data);
    return Iterator(*this, data);
}

//-------------------------------------------------------------------------

DBCFile::Iterator DBCFile::end()
{
    assert(data);
    return Iterator(*this, stringTable);
}
